Find an equation of a parabola satisfying the given conditions.Focus at (9, 0), directrix x = -9
A. y = 
x2
B. -36y = x2
C. x = 
y2
D. y2 = -36x
Answer: C
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Find an explicit formula for an.3, 5, 7, 9, 11, . . .
A. an = n + 4 B. an = 2n + 2 C. an = 2n + 1 D. an = n + 5
Simplify the expression by using the order of operations.7 ? 6 + 9(8 + 4) + 3
A. 1263 B. 153 C. 177 D. 121
Simplify.
A. does not exist as a real number B. 312 C. 26 D. 25
Solve the problem.The square root expression Rf
gives the aging rate of an astronaut relative to the aging rate of a friend on Earth, Rf, where v is the astronaut's speed and c is the speed of light. An astronaut is moving at 70% of the speed of light. Substitute 0.7c in the expression above. If 10 weeks have passed for his friend, how long, to the nearest week, was he gone?
A. 5 weeks B. 1 weeks C. 12 weeks D. 7 weeks